Set of humeral components for total shoulder prosthesis

Abstract

A set of humeral components for a total shoulder prosthesis, wherein each component is formed by an anchoring stem and a metaphyseal part which defines a concave surface of articulation in the form of a portion of a sphere. The offset between an axis of symmetry of this surface and a central axis of the metaphyseal part varies between the different components of the set. This makes it possible to limit or to avoid, by a reasoned choice of the humeral component used, an interference with the pillar of the scapula during a movement of adduction.

What is claimed is: 
     
       1. A set of humeral components for a total shoulder prosthesis, each of the components comprising an anchoring stem and a metaphyseal part, the metaphyseal part including a concave surface of articulation in a form of a portion of a sphere formed in an end surface thereof, wherein an offset between an axis of symmetry of the concave surface and a central axis of the end surface of the metaphyseal part of the components is different for each component of the set, and wherein for each component, an orientation and position of the axis of symmetry of the concave surface is non-adjustably fixed with respect to the central axis of the end surface of the metaphyseal part thereof. 
     
     
       2. The set of components of  claim 1 , wherein, for each component, the axis of symmetry and the central axis are substantially parallel. 
     
     
       3. The set of components of  claim 1 , wherein, for at least one of the components, the axis of symmetry is located, with respect to the central axis, on an opposite side of a median axis of the stem. 
     
     
       4. The set of components of  claim 3 , wherein the end surface of the metaphyseal part of each of the components defines an outer edge, the surface of articulation of at least one of the components extends to an immediate vicinity of the edge of the metaphyseal part along a portion of the edge that is spaced opposite another portion of the edge that is generally in line with the median axis of the stem. 
     
     
       5. The set of components of  claim 3 , wherein the end surface of the metaphyseal part of each of the components defines an outer edge, the surface of articulation of at least one of the components is intersected by the edge of the metaphyseal part along a portion of the edge that is spaced opposite another portion of the edge that is generally in line with the median axis of the stem. 
     
     
       6. The set of components of  claim 1 , wherein the components have substantially the same shape with an exception of positions of the articular surfaces in the metaphyseal part. 
     
     
       7. The set of components of  claim 1 , wherein an angle of inclination of the axis of symmetry with respect to a median axis of the stem has substantially the same value for each of the components. 
     
     
       8. The set of components of  claim 1 , wherein for one of the components, the offset is zero, the axis of symmetry and the central axis being merged. 
     
     
       9. A total shoulder prosthesis comprising, a glenoid component and a humeral component, a set of humeral components comprising;
 each component of the set of humeral components being formed having an anchoring stem and a metaphyseal part, the metaphyseal part including a concave surface of articulation in a form of a portion of a sphere formed in an end surface thereof, wherein an offset between an axis of symmetry of the concave surface and a central axis of the end surface of the metaphyseal part of the components is different for each component of the set, wherein for each component, an orientation and position of the axis of symmetry of the concave surface is non-adjustably fixed with respect to the central axis of the end surface of the metaphyseal part thereof, and the humeral component being selected from the set of humeral components. 
 
     
     
       10. The total prosthesis of  claim 9 , wherein the glenoid component includes a convex surface of articulation that is centered on an axis of symmetry which is not perpendicular to a rear face of the glenoid component that is adapted to come into abutment against a glenoid cavity. 
     
     
       11. The set of components of  claim 1  wherein the central axis is offset from the axis of symmetry of the concave surface so that the anchoring stem is adapted to be generally parallel to a sagittal plane at the end of adduction. 
     
     
       12. The set of components of  claim 1  wherein the metaphyseal parts and the concave surfaces comprise separate components. 
     
     
       13. A set of humeral components for a total shoulder prosthesis, the humeral components comprising:
 a first humeral component comprising a first anchoring stem and a first metaphyseal part, an end surface of the first metaphyseal part includes an outer peripheral edge and a generally spherical concave surface of articulation, a distance between an edge of the generally spherical concave surface and the outer peripheral edge varies around at least a portion of a perimeter of the metaphyseal part; and 
 a second humeral component comprising a second anchoring stem and a second metaphyseal part, an end surface of the second metaphyseal part includes an outer peripheral edge and a generally spherical concave surface of articulation, a distance between an edge of the generally spherical concave surface and the outer peripheral edge varies around at least a portion of a perimeter of the second metaphyseal part differently than the distance varies around the perimeter of the first metaphyseal part. 
 
     
     
       14. The set of humeral components of  claim 13  wherein the distance between the edge of the generally spherical concave surface and the outer peripheral edge is substantially zero around at least a portion of a perimeter of at least the first metaphyseal part. 
     
     
       15. The set of humeral components of  claim 13  wherein the distance between the edge of the generally spherical concave surface and the outer peripheral edge comprises a generally annular surface on at least the first metaphyseal part. 
     
     
       16. The set of humeral components of  claim 13  wherein the end surface of the first metaphyseal part comprises a central axis and the generally spherical concave surface comprises an axis of symmetry that is collinear with the central axis. 
     
     
       17. The set of humeral components of  claim 13  wherein the end surface of the first metaphyseal part comprises a central axis that is separated from an axis of symmetry of the generally spherical concave surface by a first offset. 
     
     
       18. The set of humeral components of  claim 17  wherein the end surface of the second metaphyseal part comprises a central axis that is separated from an axis of symmetry of the generally spherical concave surface by a second offset, wherein the first offset is different than the second offset. 
     
     
       19. The set of humeral components of  claim 13  wherein the end surface of the first metaphyseal part comprises a central axis offset from an axis of symmetry of the generally spherical concave surface so that the first anchoring stem is adapted to be generally parallel to a sagittal plane at the end of adduction. 
     
     
       20. The set of humeral components of  claim 13  wherein the end surface of the first metaphyseal part comprises a central axis located on an opposite side of a median axis of the first anchoring stem with respect to an axis of symmetry of the generally spherical concave surface. 
     
     
       21. The set of humeral components of  claim 13  wherein the end surface of the first metaphyseal part comprises a central axis that is non-adjustably fixed with respect to an axis of symmetry of the generally spherical concave surface. 
     
     
       22. The set of humeral components of  claim 13  wherein the first metaphyseal part and the generally spherical concave surface comprise separate components. 
     
     
       23. The set of humeral components of  claim 13  wherein an angle between a central axis of a metaphyseal part and a median axis of the stem is substantially the same for the first and second humeral components. 
     
     
       24. The set of humeral components of  claim 13  wherein the first metaphyseal part comprises an outer radial surface parallel to a central axis, and the central axis is offset from an axis of symmetry of the generally spherical concave surface. 
     
     
       25. The set of humeral components of  claim 13  wherein the outer peripheral edge on the first metaphyseal part is generally circular, the outer peripheral edge comprising a central axis that is offset from an axis of symmetry of the generally spherical concave surface. 
     
     
       26. The set of humeral components of  claim 25  wherein the outer peripheral edge on the second metaphyseal part is generally circular, the outer peripheral edge on the second metaphyseal part comprising a central axis that is offset from an axis of symmetry of the generally spherical concave surface by an amount different than the offset on the first metaphyseal part. 
     
     
       27. The set of humeral components of  claim 13  wherein the first and second metaphyseal parts comprises substantially the same shape except for the first and second spherical concave surfaces. 
     
     
       28. The set of humeral components of  claim 13  comprising a third humeral component comprising a third anchoring stem and a third part, an end surface of the third metaphyseal part includes an outer peripheral edge and a generally spherical concave surface of articulation, a distance between an edge of the generally spherical concave surface and the outer peripheral edge is generally constant around at least a portion of a perimeter of the third metaphyseal part. 
     
     
       29. A set of humeral components for a total shoulder prosthesis, the humeral components comprising:
 a first humeral component comprising a first anchoring stem and a first metaphyseal part, an end surface of the first metaphyseal part includes an outer peripheral edge and a generally spherical concave surface of articulation, a distance between an edge of the generally spherical concave surface and the outer peripheral edge is generally constant around at least a portion of a perimeter of the first metaphyseal part; and 
 a second humeral component comprising a second anchoring stem and a second metaphyseal part, an end surface of the second metaphyseal part includes an outer peripheral edge and a generally spherical concave surface of articulation, a distance between an edge of the generally spherical concave surface and the outer peripheral edge varies around at least a portion of a perimeter of the second metaphyseal part. 
 
     
     
       30. A set of humeral components for a total shoulder prosthesis, in which each component is formed having an anchoring stem and a metaphyseal part, the metaphyseal part including a concave surface of articulation in a form of a portion of a sphere formed in an end surface thereof, wherein an offset between an axis of symmetry of the concave surface and a central axis of the end surface of the metaphyseal part of the components is different for at least two components of the set, and wherein for each component an angle of inclination of the central axis with respect to a median axis of the anchoring stems has substantially the same value for each component. 
     
     
       31. A set of humeral components for a total shoulder prosthesis, the humeral components comprising:
 a first humeral component comprising a first anchoring stem and a first metaphyseal part with a central axis, an end surface of the first metaphyseal part includes a generally spherical concave surface of articulation with an axis of symmetry offset from the central axis; and 
 a second humeral component comprising a second anchoring stem and a second metaphyseal part with a central axis, an end surface of the second metaphyseal part includes a generally spherical concave surface of articulation with an axis of symmetry offset from the central axis, wherein the first offset is different than the second offset. 
 
     
     
       32. The set of humeral components of  claim 31  comprising a third humeral component comprising a third anchoring stem and a third metaphyseal part with a central axis, an end surface of the third metaphyseal part includes a generally spherical concave surface of articulation with an axis of symmetry offset from the central axis, wherein the third offset is different from the first and second offsets. 
     
     
       33. The set of humeral components of  claim 31  wherein the central axis of at least the first metaphyseal part is non-adjustably fixed with respect to an axis of symmetry. 
     
     
       34. The set of humeral components of  claim 31  wherein the first metaphyseal part and the generally spherical concave surface comprise separate components. 
     
     
       35. The set of humeral components of  claim 31  wherein at least the first humeral component comprises one piece. 
     
     
       36. The set of humeral components of  claim 31  wherein the distance between an edge of the generally spherical concave surface and an outer peripheral edge of the metaphyseal part is substantially zero around at least a portion of a perimeter of at least the first metaphyseal part. 
     
     
       37. The set of humeral components of  claim 31  wherein the distance between an edge of the generally spherical concave surface and an outer peripheral edge of the first metaphyseal part comprises a generally annular surface. 
     
     
       38. The set of humeral components of  claim 31  wherein the axis of symmetry is generally collinear with the central axis on the first metaphyseal part. 
     
     
       39. The set of humeral components of  claim 31  wherein at least the first anchoring stem on the first humeral component is adapted to be generally parallel to a sagittal plane at the end of adduction. 
     
     
       40. The set of humeral components of  claim 31  wherein an angle between the central axis and a median axis of the stem is substantially the same for the first and second humeral components. 
     
     
       41. The set of humeral components of  claim 31  wherein an outer peripheral edge on at least the first metaphyseal part comprises a generally circular configuration. 
     
     
       42. A total shoulder prosthesis comprising:
 the set of humeral components of  claim 31 ; and 
 a glenoid component including a rear face adapted to come into abutment against a glenoid cavity and a convex surface of articulation centered on an axis of symmetry that is not perpendicular to the rear face. 
 
     
     
       43. A total shoulder prosthesis comprising:
 the set of humeral components of  claim 31 ; and 
 a glenoid component including a rear face adapted to come into abutment against a glenoid cavity and a convex surface of articulation centered on an axis of symmetry perpendicular to the rear face. 
 
     
     
       44. The set of humeral components of  claim 13  wherein at least the first humeral component comprises one piece. 
     
     
       45. A total shoulder prosthesis comprising:
 the set of humeral components of  claim 13 ; and 
 a glenoid component including a rear face adapted to come into abutment against a glenoid cavity and a convex surface of articulation centered on an axis of symmetry that is not perpendicular to the rear face. 
 
     
     
       46. A total shoulder prosthesis comprising:
 the set of humeral components of  claim 13 ; and 
 a glenoid component including a rear face adapted to come into abutment against a glenoid cavity and a convex surface of articulation centered on an axis of symmetry perpendicular to the rear face. 
 
     
     
       47. The set of humeral components of  claim 29  wherein the distance between the edge of the generally spherical concave surface and the outer peripheral edge is substantially zero around at least a portion of the perimeter of at least one of the metaphyseal parts. 
     
     
       48. The set of humeral components of  claim 29  wherein the end surface of the second metaphyseal part comprises a central axis offset from an axis of symmetry of the generally spherical concave surface so that the second anchoring stem is adapted to be generally parallel to a sagittal plane at the end of adduction. 
     
     
       49. The set of humeral components of  claim 29  wherein the end surface of at least one of the metaphyseal parts comprises a central axis that is non-adjustably fixed with respect to an axis of symmetry of the generally spherical concave surface. 
     
     
       50. The set of humeral components of  claim 29  wherein at least one of the metaphyseal parts and the generally spherical concave surface comprise separate components. 
     
     
       51. The set of humeral components of  claim 29  wherein at least the first humeral component comprises one piece. 
     
     
       52. The set of humeral components of  claim 29  wherein an angle between a central axis of the metaphyseal parts and a median axis of the stem are substantially the same for the first and second humeral components. 
     
     
       53. The set of humeral components of  claim 29  wherein the first and second metaphyseal parts comprise substantially the same shape except for the first and second spherical concave surfaces. 
     
     
       54. A total shoulder prosthesis comprising:
 the set of humeral components of  claim 29 ; and 
 a glenoid component including a rear face adapted to come into abutment against a glenoid cavity and a convex surface of articulation centered on an axis of symmetry that is not perpendicular to the rear face. 
 
     
     
       55. A total shoulder prosthesis comprising:
 the set of humeral components of  claim 29 ; and 
 a glenoid component including a rear face adapted to come into abutment against a glenoid cavity and a convex surface of articulation centered on an axis of symmetry perpendicular to the rear face.